Acceptable tire width for given rim inner width?

[vanilla ice]

This isn't really E specific, but I'm not on any other bike forums. Anyway I just put some big 2.125x26 tires on a rigid today for good cushioning. It looks kind of funny with the skinny rims. The bike's original tires were 1.50's. I know a lot of you guys on here run fat tires so I thought I'd ask here, is this ok? I'm assuming the inner width is around 19mm from measuring the outer rim width. I did find one chart, below. According to this one, my combo is not ok. But you guys radial spoke rear wheels and do other no-no's that work out ok in the real world.. whaddaya think?

 

[recumbent]

My new 20" front Clyte 406 wheel is 32mm wide, I fit a 1.75 Schwalbe Marathon plus puncture resistant tire on it. looks totally Custom fit, perfect, i might be able to fit a 2.0 between the forks but anything more would look goofy.

The 26" rears came with 25mm wide rims and 1.50 tire, i changed it to 1.75 Schawalbe plus, also, and looks just as good, however the wider rim combination appears stronger and less tendancy to squerm.

All these mentioned will fit into the accepted gragh which look like it has been translated.

Although we have absolutely no snow here, pure sun, unlike our compatriots back east (sorry guys) summer is just around the next snowbank to shovel :lol: But we have some wind and still hovering around 8 deg. C.
Good luck and happy Ebiking in a few weeks time.

 

[vanilla ice]

It got up to 78F here yesterday, feels the same today. Almost makes for a break even deal when you factor in all the crap you have to put up with to live here. Anyway, bikes a 20 year old Specialized welded Chromo frame, with maybe 22mm wide front, like 19mm on the rear. I'm just going to leave it as it seemed ok riding around yesterday. I'm now using it with the baby seat, the main reason I wanted as much cushioning as I could get from the tires. Like I said, I've seen commerically available MTB's with similar rim/tire combos, so I guess its no big deal. I gotta say it feels kind of neat riding an old rigid with fat street tires. Not too bumpy, not too floaty, good feel and light.

BTW what are the best non-E bike forums out there?

 

[cerewa]

re: "what are the best non E bike forums" -

check out http://www.bikeforums.net ... it's a great bicycle forum site, and it's also the biggest/most active that I am aware of.

re: "what tires with what rim?"

I have seen a couple of those tables saying that such and such rim and tire combination are acceptable or not. I think they tend to be far too restrictive. As long as you can get the tire on to the rim (which is a matter of the rim's circle diameter, not its left-to-right width) you are fine using almost any (bicycle) tire with almost any rim.... except that tires over 2.5 inches won't really work with narrow road bike style rims and if you have the gigantic rims meant for 3 inch tires, you should not use narrow road tires.

 

[vanilla ice]

Just to keep this post somewhat E-bike relevant, I've already laced a cassette disc-hub to a 26" Sun triple-I-beam "25mm" (inside like 19mm) rim that might get this old bike some E power once I machine up some sort of aluminum sprocket adapter. Was looking at Avalanche's project in the photos section as a model for this one.

 

[D-Man]

The only thing I've read is that a fat tire on a skinny rim becomes a bad situation if inflated to max pressure as the rim will crack easier. I don't have to worry, I run low pressure. Of course, handling is improved if tires are sized right with rim.

 

[vanilla ice]

Hrm, mine are inflated to max, but the max for these tires is only 60psi. Interesting the 21mm and 23mm rims both have the same max tire size on that chart. I think it will be fine. I do have a spare araya rim, maybe I'll relace my rear to that rim when I have time. It'll match the front and be a little wider. Since buying my currie and joining ES I've aquired a few no-E bikes, maybe I'll give bikeforums net a try.